interFoam BC for open water

EricS · September 13, 2022, 06:03

Hello everyone!

I'm trying to simulate the flow exiting a pipe placed around 3 meters under the sea level. The case is 2D but I'm having some problems with the boundary conditions for the "sea".

So far I set:
U
inlet -> flowRateInletVelocity
outlet -> inletOutletVelocity
p

inlet -> fixedFluxPressure
outlet -> zeroGradient
alpha
inlet -> fixedValue ... value 1

outlet -> variableHeightFlowRate

With those B.Cs the simulation diverges and I can't figure out what to change to make it works...
Do you have any guess or tip?

Thank you in advance

jherb · September 13, 2022, 20:04

You do not specify the pressure with your boundary conditions. Somewhere you need some kind of fixedValue boundary condition for p (or actually for p_rgh).

EricS · September 14, 2022, 06:41

Hi and thank you for your quick answer! Actually after some tests I was able to make it work by splitting the outlet patch in two and imposing flowRateOutletVelocity in the water patch!

September 13, 2022, 06:03	interFoam BC for open water	#1
EricS Member Eric Segalerba Join Date: Dec 2021 Location: Italy Posts: 31 Rep Power: 5	Hello everyone! I'm trying to simulate the flow exiting a pipe placed around 3 meters under the sea level. The case is 2D but I'm having some problems with the boundary conditions for the "sea". So far I set: U inlet -> flowRateInletVelocity outlet -> inletOutletVelocity p inlet -> fixedFluxPressure outlet -> zeroGradient alpha inlet -> fixedValue ... value 1 outlet -> variableHeightFlowRate With those B.Cs the simulation diverges and I can't figure out what to change to make it works... Do you have any guess or tip? Thank you in advance

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September 13, 2022, 20:04		#2
jherb Senior Member Joachim Herb Join Date: Sep 2010 Posts: 650 Rep Power: 22	You do not specify the pressure with your boundary conditions. Somewhere you need some kind of fixedValue boundary condition for p (or actually for p_rgh).

September 14, 2022, 06:41		#3
EricS Member Eric Segalerba Join Date: Dec 2021 Location: Italy Posts: 31 Rep Power: 5	Hi and thank you for your quick answer! Actually after some tests I was able to make it work by splitting the outlet patch in two and imposing flowRateOutletVelocity in the water patch!